Not ANY words?
That's bad...I never seen blue screen without words.
If your computer just shows a blue screen and quickly reboot, please turn off the auto reboot option.
For most cases, blue screen when playing games is caused by driver or RAM, just try to change for another VGA card driver and see if it's solved. If not, try to clean your RAMs and DIMM slots then re-install them.
After that if the problems continues to occur, you may have to check the fans of your system. Your GPU or CPU may get too hot after gaming for a long time without proper cooling.